There are three main options for Microsoft Office 365, dependent on your organisations size and requirements:
Microsoft Office 365 for small businesses:
Microsoft Office 365 for small businesses offers an easy-to-use set of web-enabled tools for small businesses, independent consultants and professionals looking for business-class productivity services. Working with the tools people know and use today, Office 365 provides anywhere access to email, important documents, contacts, and calendars on nearly any device.
Microsoft Office 365 for enterprises
Microsoft Office 365 for enterprises brings together Cloud versions of Microsoft’s trusted communications and collaboration software with Microsoft’s familiar Office Professional Plus desktop suite. It is designed to help meet your IT needs for robust security, 24/7 reliability, and user productivity. There are a variety of plans to meet the needs of businesses of all sizes and varying IT needs. Office 365 also has solutions for the kiosk worker - suitable for people in larger businesses who do not have a dedicated computer.
Microsoft Office 365 for education:
Microsoft Office 365 for education provides your institution with the same great communication and collaboration experiences used in enterprises around the world, while saving time and money. Microsoft Office 365 for education delivers all of this and more while training students on familiar software which employers depend upon.
Office 365 for professionals and small businesses:
Access your email, documents, calendars and contacts from virtually anywhere and on almost any device with pay-as-you-go subscriptions. Office 365 'Plan 1' for small business is suitable for organisations with 1-50 users and includes Office Web Apps, Exchange Online, SharePoint Online, Lync Online, and an external website. It is designed specifically for smaller businesses and professionals who are looking for cloud-based productivity tools without the IT hassle.
Office 365 is designed to meet the needs of organisations of all sizes. New flexible purchase options mean you can choose between monthly or annual billing options, buy only what you need and scale up and down as required.